Isuzu A-4BG1 Workshop Manual page 172

I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I II II I I I I I II II II II II I I I I I I I I I
12-A TROUBLESHOOTING
HARD STARTING
3) ENGINE TURNS OVER BUT DOES NOT START
FUEL IS BEING DELIVERED TO THE INJECTION PUMP
Checkpoint
Trouble
Cause
Continued from the previous page
OK I
tnjection nozzle
Injection pump
Remedy
Jnjection nozzle injection starting
pressure too low
Improper spray condition
I
I
NG
-i
Defective fuel injection nozzle
resulting in fuel drippage after
NG
t-i
Replace the delivery valve
fuel injection
Adjust or replace the injection
nozzle
NG Defective injection pump control
NG
rack operation
I-
Repair or replace the injection
pump control rack
\
NG Injection pump plunger worn or
stuck
NG Replace the injection pump
plunger assembly
. ..C
OK I
Injection pump (VE pump)
NG
injection pump drive shaft seizure NG Replace the injection pump drive
or other damage shaft
I
t
7
i
NG Injection pump governor spring
seizure
NG Replace the injection pump
governor spring